Apparatus for printing engravings in intaglio.



A.-VALBNTIN, J. ZERREISS & H. GEORGES. APPARATUS FOR PRINTING ENGRAVINGSIN INTAGLIO.

APPLICATION FILED MAY 29, 1911.

Patented Apr. 16, 1912.

APPARATUS r012. PRINTING nneaavmcs 11v m'racmo.

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Specification of Letters latent.

Patented Apr.16, 1912.

Application filed May 29, '1911. Serial naeaalsi.

To all whom it may ooncem: 4 4

Be it known that we, AUcUs'rn VALENTIN, JEAN ZERREIss,and HENRI Gnoncns,residin at Puteaux, France, have invented new a-n useful Improvements inApparatus for Printing of Engravings in Intaglio, of which thefollowingis a specification.

The printing of engravings in intaglio, in which scraper wiping is used,is usually effected from cylinders engraved in intaglio, and for directimpression it is not possible to engrave illustrations otherwise than ona single cylinder of greater length than the width of the paper, as theedges ofthe said cylinder would trace marks on the pa.- per at the timeof printing. On the other hand, when it is desired to print togetherengravings in intaglio and letterpress for printing illustrated matter,it frequently,

happens that the engravings are"arranged' in the text in a small number,and in a large number of cases there are only one or two engravings onthe whole sheet of paper.

Direct printing therefore necessitates in all cases the use of acylinder of greater length than the width of the paper to be printed,

which implies a delicate adjustment of a scraper on the whole length ofthe cylinder, even in those cases in which there is only one engravingon the said cylinder, which makes theoperations long and expensive.Indirect printing enables the aforesaid '-disadvantages tobe avoided. Itis in fact possible to limit the pressure of the transferring blanket onthe surface of the engraved portions, by suitably arranging under theblanket raised portions bearing only onthe engravings, which makes itvpossible to use for the engravi-n cylinders of smaller length than thewldth of the paper, and it even becomes possible to combine on one andthe same mandrel one or more sleeves engraved in intaglio, the edges orjoints of which will not leave any mark on the paper at the time ofprinting, and which will enable scrapers to be used which do not exceedjthe length of the engraved sleeves, whichgreatly simplifies theadjustment of "the scrapers and renders the operations quicker and lessexpensive.

This invention relates to the use of such sleeves engraved in intaglioand also'to a device enabling the said sleeves to be used for indirectimpression .of engravings. in intaglioa .1

The figure is a transverse sectional view question being afte throughthe impression roller and through the transfer-roller showing inelevation the wipers. I l

The device comprises: 1. ,A steel mandrel 1 provided at each of its ends"with trunnions Qandj 3:1whioh are adapted to engage with the bearingsof the machine. 2. A

series of cylindrical steel sleeves 4 which are covered by electrolysiswith a layer of copper, then trued and suitably polished to rece1ve theengraving. 3. A series of rings 5 which are used for filling up thespaces that may be left between the engraved sleeves arranged on themandrel.

The mandrel 1 consists of a steel spindle terminating at each of itsends in trunnions 2 and 3. This mandrel has also a screwthreadedportion6 on which is engaged the slide with slight frictionon' the mandrel 1..These rings, covered with an electrolytic copper deposit, are perfectlypolished and afterward engraved in intaglio by any,

known engraving process, the sleeves 1n rward placed at the deslredpoint of the mandrel 1.

The rings5 are of less thickness than the sleeves, so as to'enable theintervals separating the engraved sleeves to be filled whenthe positionsof the said sleeves on the mandrel 1 are determined in accordance with agiven arrangement. 7

The operation of the device will be readily understood. 4

First of all, the first engraved sleeve is placed on the mandrel 1, andits longitudlnal. position adjusted. Then the second sleeve is placed inposition, then the others, the intervals being filled successively witha series of rings of suitable thickness. The nut 7 is then tightened,and will press against the'engraved sleevesand keep them in place. Themandrel thus arranged is placed on the printing machine, and the sleevesrotated so as to bring the engravings into correct position, that is, sothat they will be printed at the point which they have to occupy on thepaper. When the position is determined, the nut 7 is screwed home andthe engraved sleeves will be thus fixed on the mandrel. After havingstuck, by glue for instance, to the cylinder C projectlons or raisedportions 10 constituted by a suitable thickness of paper or any othermaterial, the blanket '11 1s stretched on the cylinder, and theprojections or raised portions will mark in relief on the surface of thesaid blanket, the surfaces of the engravings. The scrapers 12, 13 and 14are then adjustedm the usual manner, and the printing can be proceededwith.

We claim In an apparatus for printing engravings in intaglio, a mandrel,a plurality of engraved sleeves mounted upon the mandrel, a cylinder, anelastic blanket stretched upon the cylinder, and bodies interposedbetween the blanket and the cylinder providing. projections upon thesurface of the blanket.

In testimony whereof we affix our signature in presence of twowitnesses.

J ULIEN EAVERNE.

